CN101152653B - Method for rolling titanium and titanium alloy bar wire bar with three-roller type Y continuous rolling mill - Google Patents
Method for rolling titanium and titanium alloy bar wire bar with three-roller type Y continuous rolling mill Download PDFInfo
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- CN101152653B CN101152653B CN2006100691081A CN200610069108A CN101152653B CN 101152653 B CN101152653 B CN 101152653B CN 2006100691081 A CN2006100691081 A CN 2006100691081A CN 200610069108 A CN200610069108 A CN 200610069108A CN 101152653 B CN101152653 B CN 101152653B
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Abstract
The invention provides a method for rolling of titanium and titanium alloy bar wire rod with a three-roller Y continuous rolling mill. The technical proposal of the invention is as follows that the three-roller Y continuous rolling mill group is used for 6 to 18 pass continuous rolling of heated titanium and titanium alloy bar billet of phi 50mm to form bar billet of 30 to 8mm (or hexagonal and triangular structure of 24 to 8mm) or rolling wire billet of phi 20 to 8mm. by adopting the method, bar billet of phi 50mm can be rolled into bar billet of phi 30 to 8mm (or triangular and hexagonal structure) or rolling wire billet of phi 20 to 8mm after heated for one time. Compared with the prior methods of multiple fire time casting, swaging, two-roller transverse-arrangement non-continuous rolling and two-roller longitudinal-arrangement continuous rolling, all of which are used for production of titanium and titanium alloy bar or rolling wire billet, the invention not only has the advantages of high efficiency, energy saving, low noise, small occupying and high precision of the size as well as good organization perforation of titanium and titanium alloy bar and wire rod, but also can produce triangular or hexagonal section and other allotype section.
Description
Technical field
The present invention relates to a kind of processing method of titanium or titanium alloy rod wire rod
Technical background
Titanium or titanium alloy has that height ratio is strong, acid and alkali-resistance, with the strong characteristics of human body affinity, and be widely used in industries such as aviation, medicine, petrochemical industry.At present, the general employing of domestic production Φ 30-8mm titanium or titanium alloy bar forge, swage, rolling three kinds of methods; Φ 20-8mm titanium or titanium alloy becomes the spiral base generally to adopt milling method.
Existing method one: forge
Forging be rare metal cogging and forge bar, cake material, ring material etc. one of basic skills, forging equipment can use common apparatus such as forging hammer, hydraulic press, also can produce special equipments such as using precise forging machine.Φ 30-20mm bar adopts the electric air hammer usually, and forging method is with after the heating of Φ 50mm rod base, forges through many fire, can process the excellent base of Φ 30-20mm.
Advantage with the method for forging processing titanium or titanium alloy bar is that equipment is simple, small investment, and is simple to operate; Shortcoming is work under bad environment (noise is big, temperature is high), add showing tremendous enthusiasm time many, energy consumption is high, interruption times is many, yield rate is low, bar length is lacked (generally at 1-2m), ovality (2-3mm), surface quality poor (easily crack, folding, load mould etc.) greatly.
Existing method two: swage
Swaging comes down to a kind of special shape of die forging, the operation principle of swager be by two forging dies on the one hand around being rotated at a high speed by forging stock bar axis, simultaneously, again the base bar is carried out high speed on the other hand and forges, from but the base bar be out of shape.The technology of swaging is with after the heating of Φ 20mm rod base, forges through many fire, can process the excellent base of Φ 18-8mm.
The advantage of the method for processing the titanium or titanium alloy bar with swaging is that equipment is simple, small investment, and is simple to operate; Shortcoming is work under bad environment (noise is big, temperature is high), operative employee's labour intensity is big, production efficiency is low, add showing tremendous enthusiasm time many, energy consumption is high, bar length short (generally at 1-2m), surface quality poor (easily crack, distortion etc.), pass deformation is little, only be confined to the bar areal deformation, bar ectonexine structure property differs greatly.
Existing three: two rolling systems of method
Use 250 two-roller mills and both can produce the bar of Φ 30-8mm, can produce the rolling wire rod of Φ 16-8mm again.Different by the arrangement of frame and rolling mode, 250 liang of rolling systems can be divided into two kinds of the discontinuous rolling and lap siding continuous rollings of cross-arranging type.
250 liang of roller cross-arranging types are discontinuous rolling
250 liang of discontinuous milling trains of roller cross-arranging type as shown in Figure 1, its advantage is that automatically controlled and transmission is simple, shortcoming is to be that mill speed can not change with technological requirement, causes thus:
1. mill speed has only 1 grade, and is too low concerning finisher, and too fast concerning roughing;
2. temperature is fallen too soon, and product substance little (about 5kg), small dimension product are difficult to produce, and the product size fluctuation is big;
3. produce instability, labour intensity is big, too much relies on operating personnel's skill.
250 liang of roller lap sidings are rolling
250 liang of roller lap siding continuous-rollings as shown in Figure 2, its shortcoming is automatically controlled and transmission complexity, advantage is:
1. tandem rolling can guarantee that each road mill speed increases in proportion with the rolled piece lengthening coefficient, high-speed rolling when low speed is nipped with finish rolling when having realized roughing;
2. very little (heating up on the contrary after reaching certain speed) falls in temperature, guaranteed desired rolling temperature.Because avoided reciprocal rolling and traversing during tandem rolling, saved the time.
The deficiency of the rolling titanium or titanium alloy rod of 250 two-roller mills wire rod
250 two-roller mills (the discontinuous rolling or lap siding continuous rolling of cross-arranging type) are rolled into the rolling wire rod method of Φ 30-8mm bar or Φ 16-8mm, because rolled piece receives two to compression stress, easily produce straight on the head cracking, spread and are prone to the ears or side handles of a utensil greatly; Adopt 90 ° of distortions rolling, rolled piece is unstable in the inlet guide and guard in addition, cause rolling in waste material many, yield rate is low.Three-roller Y shaped tandem mill
At the deficiency of two-roller mill, people's three-roller Y shaped tandem mill that begins one's study.
Three-roller Y shaped tandem mill design feature
Three-roller Y shaped milling train is called for short y-type rolling mill.At first be on the basis of the mature experience of the steel pipe stretch-reducing mill of succeeding in developing in 1975, to grow up, be mainly used in rolling ferrous metal and non-ferrous metal by German KOCKS company.Nineteen nineties, the U.S. just begins to be used for rolling titanium or titanium alloy rod wire rod.But China 1980s, the nineties are applied to rolled steel wire rod, tungsten wire rod with Y type tandem mill, but y-type rolling mill are not applied to the production of titanium or titanium alloy rod wire rod always.
The maximum characteristics that y-type rolling mill is different from other milling train are that 3 discoid roll (see figure 3)s that are mutually 120 ° of angles of cut are arranged in the frame, and wherein 3.1 is roll, and 3.2 is power transmission shaft, and 3.3 is travelling gear; Its groove is formed pass, sees its profile, and the layout of three rolls is similar in appearance to letter " Y ", so claim y-type rolling mill.
Through the development and change of decades, the three-roller Y shaped tandem mill that adopts both at home and abroad can be divided into two kinds in the three-roller Y shaped milling train of the three-roller Y shaped milling train of closed frame and open top roll housing according to the difference of frame form at present.General closed frame memorial archway is integral cast steel (cast iron) structure, and the open top roll housing memorial archway is connect two cast steels (cast iron) open type memorial archway by 3 high-strength bolts and forms, and is convenient to install and remove roll and changes pass.
Difference according to the frame kind of drive, frame has last driver frame and two kinds of forms of underdrive frame (seeing Fig. 3 a.b), and the last transmission of same unit and underdrive frame all adopt with a kind of frame, just in use reverse and get final product, not only make institute's organic frame of same unit can be general, and can make full use of roll.
Generally speaking, the last driver frame of same unit or underdrive frame are equipped with turnover, mouthful guide and guards that is used for guide, guide and guards has slidingtype guide and guard and two kinds of forms of roll-type guide and guard, can select different guide and guards according to the form of frame pass, the size of workpiece measurement and the required precision of finished product etc.
Three-roller Y shaped tandem mill is comprised by main transmission that generally several parts such as main driving motor 4.1, reductor 4.3, gear-box 4.4, work housing 4.6, gantry base 4.5, drawing mechanism 4.9, electric control gear 4.8, thin oil lubricating device 4.7 and accessory system form.Main driving motor carries out collective's transmission by institute's organic frame of reductor 4.3 and 4.4 pairs of same units of gear-box, sometimes last frame is adopted differential speed motor 4.2 accessory drive, with the control finished product accuracy.Transmission speed ratio between the frame determines that according to technological requirement the back is constant, and speed ratio is identical as far as possible between frame, so that simplify transmission device, is beneficial to manufacturing.See Fig. 4.
The pass characteristics of three-roller Y shaped milling train
The pass of three-roller Y shaped milling train is surrounded (Fig. 5) by the groove on 3 rolls that are mutually 120 ° of angles of cut, roll compresses rolled piece simultaneously from 3 symmetry directions, in following a time, roll is turned 180 °, at other is to compress rolled piece on 3 symmetry directions, rolled piece is subjected to the compression (Fig. 6) of 6 directions in the operation of rolling alternately, so the cooling of the distortion of rolled piece and periphery all compare evenly, and is very favourable to assurance finished product mill bar quality.
Compare with two roller passes, rolled piece unrestricted spread area is few in the three-roller Y shaped design of section of rolling mill, particularly the spherical triangle pass; the arc limit is to spreading and certain effect of contraction being arranged; thereby three-roller Y shaped milling train rolled piece absolute spread will lack relatively, pass is not full of when rolling, and rolled piece is difficult for producing the ears or side handles of a utensil and backfin.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of new titanium or titanium alloy bar and wire rod rolling process method has been proposed, it have the little and structure property of diameter deviation energy-conservation, efficient, the excellent wire rod of titanium or titanium alloy evenly, the characteristics that can produce special-shaped section bars such as triangle or six sides.
Thinking of the present invention is formed three-roller Y shaped tandem mill by equipment such as chassis heating furnace, three-roller Y shaped tandem rolling unit, flying shear, cold bed, coiling machine, raceways and is listed as and realizes.Referring to shown in Figure 7, wherein: 7.1 is excellent blank heating equipment, and 7.2 is 380 roughing units, and 7.3 is milling train group in 320, and 7.4 is cold bed, and 7.5 is 250 mm finishing mill unit, and 7.7 is coiling machine, and 7.8 is flying shear, and 7.9 is roller-way.
The method of the rolling pure titanium or titanium alloy rod wire rod of three-roller Y shaped tandem mill of the present invention, it is by the heating process in the three-roller Y shaped tandem rolling mill of control, slightly,, the pass of finishing tandem rolling unit, speed, through shearing, cooling, coiling technique, after the titanium or titanium alloy of diameter of phi 50 * 15000mm rod base once heated, rolling is finished product circle (or 24-8mm six sides, the triangle) bar of Φ 30-8 and the rolling wire rod of Φ 20-8mm (substance is 100kg).
Characteristics of the present invention
1. the rolled piece surface quality is good, and is straight on the head few.Because rolled piece is in the three-dimensional compressive stress state in three-high mill, three compressions, six processing, therefore distortion is evenly spreaded little.So just guarantee that the rolled piece surface quality is good, straight on the head few.
2. energy efficient improves the rolled piece hot processing temperature.Reason is the good deformation state of rolled piece in three-roller Y shaped milling train, and the deformation energy loss-rate two-roller mill (two-roller mill deformation pattern see Figure 13) of rolled piece in three-roller Y shaped milling train hangs down 20%-30%.Adopt blank heating once just can be rolled down to the excellent wire rod of Φ 30-8mm in addition.
3. rolling kind, specification limit are wide, and a cover pass can adapt to pure titanium, titanium alloy.Reason is, rolled piece unrestricted spread in triangle (arc triangle) pass did not have the problem of being full of, small in addition tension force, so the varietal adaptation of rolled piece is very wide.Aspect rolling specs, a cover is thick, in, smart pass both can shut out the specification of Φ 30-8mm.
4. the even tissue of excellent wire rod.Adopt a fire time tandem rolling system, though reduced the heating number of times, improved production efficiency, but because total working modulus of deformation velocity fast (satisfying tandem rolling), deflection big (being worked into Φ 8mm from Φ 50mm) reaches 97.44%), titanium or titanium alloy heat radiation itself slowly, easy like this is that excellent wire rod generation is overheated, the phenomenon that material glues roll appears in tissue odds when serious.Among the present invention, adopt the breaking down speed of milling train group in reducing, be provided with the roller-way of certain-length between per three frames, the special roller-way of length of between middle milling train group and mm finishing mill unit, having installed, and water cooling plant has been installed, the device for cooling of when air cooling can not satisfy, can fetching boiling water, control material temperature on roller-way, it is overheated to prevent that material from producing, and guarantees the even tissue and the surface quality of titanium or titanium alloy rod wire rod.
Description of drawings
Fig. 1 is 250 liang of discontinuous rolling flow charts of roller cross-arranging type, and 1 is heating furnace among the figure, and 10 is motor, and 11 is reductor, and 12 is roll, and 6 is curler.；
Fig. 2 is 250 liang of roller lap siding continuous rolling flow charts; 1 is heating furnace among the figure, and 2 are the roughing unit, and 3 is middle milling train group, and 5 is mm finishing mill unit, and 6 is curler.
Fig. 3 is a transmission frame schematic diagram; Fig. 3 a is last gear frame, and Fig. 3 b is the underdrive frame, and wherein 3.1 is roll, and 3.2 is power transmission shaft, and 3.3 is travelling gear;
Fig. 4 lists intention for three-roller Y shaped tandem mill machine; Wherein 4.1 is main motor, and 4.2 is differential speed motor, and 4.3 is reductor, and 4.4 is gear-box, 4.5 gantry base, and 4.6 is work housing; 4.7 be lube plant, 4.8 is electric control gear, 4.9 is drawing mechanism.
Fig. 5 is three-roller Y shaped machine pass shape figure; D is the pass inscribed circle diameter; R is a radius of curvature, and h ' is a pass elongated major semiaxis, and a is a molded breadth, and r is the pass semi-minor axis.
Fig. 6 is a roll compression piece schematic diagram; Fig. 6 a is that passage is rolling, and Fig. 6 b+1 passage is rolling;
Fig. 7 is the rolling titanium bar of 380/250 a three-roller Y shaped tandem mill line schematic diagram; Wherein: 7.1 is excellent blank heating equipment, and 7.2 is 380 roughing units, and 7.3 is milling train group in 320, and 7.4 is cold bed, and 7.5 is 250 mm finishing mill unit, and 7.7 is coiling machine, and 7.8 is flying shear, and 7.9 is roller-way.
Fig. 8 is an arc triangle pass schedule;
Fig. 9 is flat triangle pass schedule
Figure 10 is arc triangle-circular hole system;
Figure 11 is flat triangle-arc triangle-circular hole system;
Figure 12 is three-high mill deformation of rolled wire figure; Figure 12 a is 12.1 sectional views, and Figure 12 b is 12.2 sectional views, and Figure 12 c is 12.3 sectional views,
Figure 13 is duo mill deformation of rolled wire figure.Figure 13 a is 13.1 sectional views, and Figure 13 b is 13.2 sectional views, and Figure 13 c is 13.3 sectional views.
The specific embodiment:
Below form three-roller Y shaped tandem mill row with regard to equipment such as chassis heating furnace, three-roller Y shaped tandem rolling unit, flying shear, cold bed, coiling machine, roller-ways each equipment describe:
The chassis heating furnace:
Important technological parameters:
Model: HL-180
Rated power: 360-180kw
Rated voltage: 380V
The number of phases: 3N
Frequency: 50HZ
Rated temperature: 1100 ℃
Thermal treatment zone number: 12-6
Heating element heater connection: Y
Working size: 14000-7000 * 500 * 500mm (L * W * H)
Empty stove heating-up time :≤2-4h (20 ℃ → 1100 ℃)
Temperature uniformity: ± 10 ℃
Temperature-controlled precision: ± 1 ℃
Surface temperature rise: (sidewall)≤50 ℃
Chassis
Chassis mainly is made up of chassis, fireproof heat-insulating layer and drive system;
◆ box structure is made by steel plate and shaped steel in the chassis, satisfies requirement of strength, has increased car body rigidity, prevents the distortion in the car body heating process;
◆ drive system adopts the motor reducer structure.
Mechanical localization mechanism before and after chassis has is provided with spring damping machinery at the body of heater terminal point and reduces impact;
Labyrinth seal structure is adopted in pallet bottom and body of heater both sides;
Chassis and fire door be chain, have only the oven door opening chassis that puts in place to move;
Lay the position
Totally 3 in heating furnace is respectively placed 1 in each group before milling train, so just the excellent base of rolling all size and change a social system the underproof product of roughing unit, the production of middle milling train group easily.
Three-roller Y shaped tandem rolling unit
Three-roller Y shaped tandem rolling unit is by roughing mill, and--250 three-roller continuous rolling mills are composed in series for 380 three-roller continuous rolling mills, middle milling train--320 three-roller continuous rolling mills, finishing mill--.
Three roller Y tandem rolling unit major parameters
The major parameter of the three-roller Y shaped tandem rolling unit of table 2.1
Three-roller Y shaped tandem mill roller pass
The pass schedule of three-roller Y shaped tandem mill mainly contains elongation pass and finishing groove.It is not that very strict semi-finished product are rolling that elongation pass generally is used for the rolled piece final size is required, and is characterized in that lengthening coefficient is bigger, and rolled piece is out of shape rapidly.Finishing groove is used for the very strict finished product of the size of finished product rolled piece, shape need rolling more.
Pass schedule has three kinds substantially with regard to the geometry of pass: arc triangle pass schedule, flat triangle pass schedule and arc triangle-circular hole system, and as Fig. 8, Fig. 9, Figure 10, Figure 11.
Comparatively speaking, it is bigger that arc triangle pass schedule spreads surplus, and rolled piece is difficult for producing the ears or side handles of a utensil and backfin, and rolled piece does not have obvious wedge angle, and stress distribution is better, is suitable for rolling inductile metal, but deep camber arc triangle rolled piece is bigger in the FREE TORSION in defend, poor stability when rolling; There is big wedge angle in flat triangle pass schedule rolled piece, and easily stress is concentrated and the bight effect occurred, and during rolling inductile metal, favourable not as arc triangle pass schedule, but stability is better when rolling; Can go out finished product in the middle of flat triangle-circular hole system, but the pass wearing and tearing are uneven, frame tension force inequality.
In flat triangle pass schedule, can go out equilateral triangle, regular hexagon profiled piece, can go out the circular rod wire rod in arc triangle-circular hole system.
Three-roller Y shaped tandem mill deformation of rolled wire figure
The distortion of rolled piece in three-high mill and two-roller mill as shown in Figure 12 and Figure 13.
As seen from Figure 12, rolled piece is in the three-dimensional compressive stress state in three-high mill, three compressions, and six processing, therefore distortion is evenly spreaded little.So just guarantee that the rolled piece surface quality is good, straight on the head few.
Energy efficient improves the rolled piece hot processing temperature.Because the good deformation state of rolled piece in three-roller Y shaped milling train, the deformation energy loss-rate two-roller mill of rolled piece in three-roller Y shaped milling train hangs down 20%-30%.
Rolling kind, specification limit are wide, and a cover pass can adapt to pure titanium, titanium alloy.Reason is, rolled piece unrestricted spread in triangle (arc triangle) pass did not have the problem of being full of, small in addition tension force, so the varietal adaptation of rolled piece is very wide.Aspect rolling specs, a cover is thick, in, smart pass both can shut out the specification of Φ 30-8mm.
Flying shear
In 380/250 three-roller continuous rolling mill, comprise 3 flying shears, i.e. the 1st flying shear, the 2nd flying shear, the 3rd flying shear.
The 1st flying shear is installed in the rear portion of the 6th frame of roughing unit, be used to remove the termination of the front portion of rolled piece, and this rolled piece is to come out from the 6th frame of roughing unit.The working system of cutter has been to formula.
The 2nd flying shear is installed in the front portion of the 1st cold bed, is used for cutting off in advance bar, perhaps removes the anterior termination of the line base that is sent to mm finishing mill unit.The working system of flying shear has been to formula.
The 3rd flying shear is installed in the front of the 2nd cold bed, is used for before bar is sent to cold bed they being cut off.The working system of flying shear is to be interrupted continuously, has a cutting passage.
The basic mechanical design feature of table 2.3 flying shear
Cold bed
Milling train has been equipped the 1st and the 2nd totally two spiral cold beds with cydariform kickoff.Cold bed is used to accept and cool off the hot pole material and the profiled piece of pure titanium, titanium alloy, and they are sheared through flying shear.The back of milling train group during the 1st cold bed is installed in, the 2nd cold bed is installed in the back of mm finishing mill unit.Include bar in each cold bed and cut the abrasive wheel cutting machine of scale.
The technical parameter of table 2.2 cold bed
Coiling machine
In order to make Φ 20-8mm wire rod rolling, the 1st and the 2nd coiling machine has been installed on milling train, the 1st coiling machine is installed in middle milling train group back, and No. 2 coiling machine is installed in the mm finishing mill unit back.
The 1st coiling machine part and the 2nd coiling machine part all comprise two coiling machines in the composition of oneself, and have transporter, dish title and baler.
The important technological parameters of table 2.4 coiling machine
Roller-way
Roller-way is a series of drive roll, pusher, conveying roller, dispenser device, kickoff and to the composition of equipment such as the water-cooling apparatus of rolled piece, profilograph, infrared thermometry meter, they are on the process production line of mill train, the capital equipment of milling train is coupled together, form rolling line.
Technological parameter
Heating-up temperature
The rod blank heats in the chassis heating furnace, and heating-up temperature is:
Pure titanium: 600 ℃-850 ℃.
Titanium alloy: 800 ℃-1050 ℃.
Lengthening coefficient
Milling train passage lengthening coefficient is:
380 groups of milling train groups: semi-finished product passage lengthening coefficient 1.2-1.5, final pass lengthening coefficient 1.04-1.3.
Milling train group in 320: semi-finished product passage lengthening coefficient 1.1-1.4, final pass lengthening coefficient 1.03-1.2.
250 mm finishing mill unit: semi-finished product passage lengthening coefficient 1.1-1.3, final pass lengthening coefficient 1.02-1.1.
Mill speed
Mill speed is:
380 groups of milling train group: 0.1m/s-0.5m/s.
Milling train group: 0.4m/s-2.5m/s in 320.
250 mm finishing mill unit: 2.0m/s-8.5m/s.
Pass
The semi-finished product pass adopts plane triangle, but between roughing unit and the middle milling train group, middle milling train group adopts the hexagon pass on the last frame of mm finishing mill unit, making the semi-finished product of each group milling train is regular hexagon, so that blank rolls on the roller-way between roughing unit and the middle milling train group, between middle milling train group and the mm finishing mill unit.
In flat triangle pass schedule, go out equilateral triangle, regular hexagon profiled piece, go out the circular rod wire rod in arc triangle-circular hole system.
Rolling mill practice
Formulated the Rolling Production technological procedure of pure titanium or titanium alloy rod wire rod according to the requirement of the trade mark of stocking and finished product, these technological procedures comprise the heating of excellent base, rolling, flying shear, cooling, cutting technique and check system, guarantee the equipment safety operation of rolling line and produce satisfactory excellent wire product.
The rolling various excellent wire rods of 380/250 three-roller Y shaped tandem mill (containing profile shapes) all are to carry out according to the rolling mill practice flow process of determining, are to utilize whole frames or part frame, and this will determine according to the size of rolled piece (excellent wire rod, profiled piece).The adjustment of changing the working roll of milling train and carrying out working roll is, undertaken by the primitive rule of the replacing of working roll and adjustment.
3.1 heating
The original blank of producing pure titanium or titanium alloy rod wire rod should be that requirement, the surface that chemical composition meets the trade mark of demarcation is that the rolling rod of car light or bar, the diameter of forging are Φ 50 ± 1.5mm.
The specification and the surface state of heating furnace heating blank see Table 3.1.
The specification and the surface state of table 3.1 heating furnace heating material
Heat in the chassis heating furnace by heating process (table 3.1).
Table 3.2 heating cycle
Rolling in thick tandem rolling unit
Through heating the excellent base of Φ 50mm, send into No. 1 frame of thick tandem rolling unit with roller-way.Blank should be complementary with the linear velocity than No. 1 breast roller along the travelling speed of roller-way.The speed of roll can be controlled by the frequency of its motor.
According to the rolling mill practice flow process, rolling in thick tandem mill is that continuous rolling is carried out.Regulate the workpiece measurement after each frame of thick tandem mill and the speed of drive motor according to the pass design of determining already (seeing Table 3.3).The mill speed scope of roughing mill is 0.1m/s-0.5m/s.
The elongation pass of roughing mill is flat triangle pass schedule (pass of the 6th frame is the hexagon pass), and lengthening coefficient is 1.2-1.5; Last groove is flat triangle pass schedule and arc triangle-circular hole system, and lengthening coefficient is 1.04-1.3.
The finishing temperature of rolled piece is controlled at: pure titanium is 500-850 ℃; 700 ℃-1050 ℃ of titanium alloys.
After last frame of thick tandem rolling unit, on No. 1 flying shear, cut away the front end that length is each root rolled piece of 50mm-80mm.
Rolling in middle tandem rolling unit
Blank at middle tandem rolling unit has two kinds, and a kind of is the hexagonal material that thick tandem rolling unit shuts out, and another kind is the material after the heating of No. 2 heating material.No. 2 heating process sees Table 3.2.
The speed of the roll of the 1st frame of the movement velocity of rolled piece and middle tandem rolling unit cooperates.In rolling in the tandem rolling unit be continuous, when rolling thick tandem rolling unit shut out material, thick tandem rolling unit and middle tandem rolling unit were again continuous.
According to the rolling mill practice flow process, rolling in thick tandem mill is that continuous rolling is carried out.The workpiece measurement in regulating according to the pass design of determining already (seeing Table 3.3) after each frame of tandem mill and the speed of drive motor.The mill speed scope of middle milling train is 0.4m/s-2.5m/s.
The elongation pass of middle milling train is flat triangle pass schedule (pass of the 12nd frame is the hexagon pass), and lengthening coefficient is 1.2-1.5; Last groove is flat triangle pass schedule and arc triangle-circular hole system, and lengthening coefficient is 1.04-1.3.
The finishing temperature of rolled piece is controlled at: pure titanium is 500-850 ℃; 700 ℃-1050 ℃ of titanium alloys.
After last frame of thick tandem rolling unit, on No. 1 flying shear, cut away the front end that length is each root rolled piece of 50mm-80mm.
Be determined at the rolled piece cross dimension after the frame No. 12 by profilograph.Detect the temperature of rolled piece by means of the infrared thermometry meter of the 12nd frame back, in case of necessity, the cooling device of opening on the roller-way cools off rolled piece, and the rolling temperature that guarantees the rolled piece after the 12nd frame is than low 30 ℃-70 ℃ of the blank heating temperature of the 1st frame front.
The bar of Φ 30-16mm by roughing mill and middle mill milling, 17mm hexagon section bar.
Rolling rolled piece can be taked following three kinds of means of transportation after the 12nd frame:
1. be sent to cold bed and cutting machine part;
2. be sent to the rolling part;
3. be sent to 250 tandem rolling units, so that produce the section bar of Φ 14-8mm.
The bar of Φ 30-16mm (24-17mm six sides)
In 320 tandem rolling units rolling after, be sent to before the cold bed, on No. 2 flying shear, Φ 30-16mm, 24-17mm hexagon, leg-of-mutton rolled piece are cut off.According to the size of rolling section bar blank and the relation of rolling task, determine the length of cutting off.
By means of No. 1 distributor and roller-way, the bar of shearing in advance is sent to cold bed No. 1, being cooled to temperature at air is 200-400 ℃.Chilled bar is sent to the discharge roller-way from cold bed, transports to finished product bar cut-off parts again.
At the abrasive cutting-off machine bar material cutting is become scale, here the length of Qie Duaning is according to the finished product charter, is determined by mobile stopper.According to the use rules of cutting machine, according to the sectional dimension of bar, to select the working system of cutting machine and cut off the quantity of bar simultaneously, the quality of shearing is dealt with the requirement of composite stocking.
For mechanical performance and the institutional framework that detects stocking, and the quality of control finished product stocking, should on stocking, take a sample.
Φ 20-16mm coiled material
By means of dispenser device the rolled piece of Φ 20-16mm is sent to coiling machine No. 1, here rolled piece is wound up on the coil of wire of Φ 900mm.The finished product coil of wire is put on the platform conveyer, forwards on the baler again.When carrying the rolled piece of coiled coiled and carry out the air cooling, the cooled temperature of coiling is about 200 ℃-400 ℃.
On baler, take a sample, so that detect institutional framework and mechanical performance.
17mm hexagon blank
In order in the finishing tandem rolling unit, to be rolled, on No. 2 cutting machine, each root rolled piece is cut away the front end that length is 80-150mm.
By means of distributor and roller-way rolled piece being sent to the finishing tandem rolling unit is rolled.
Rolled piece is at the roller-way that is sent to the finishing tandem rolling unit
Rolling in the finishing tandem rolling machine class value
Blank at the finishing tandem rolling unit has two kinds, and a kind of is the material of the hexagonal row that shuts out of middle tandem rolling unit, and another kind is the material after the heating of No. 3 heating material.No. 3 heating process sees Table 3.2.
The speed of the roll of the 1st frame of the movement velocity of rolled piece and finishing tandem rolling unit cooperates.Rolling in the finishing tandem rolling unit is continuous, and when the tandem rolling unit shut out material in rolling, middle tandem rolling unit and finishing tandem rolling unit were again continuous.
If cool suitable temperature during therefrom the line base that comes in the tandem rolling unit should be carried on the way on the roller-way between No. 12 frame and the 13rd frame, guarantee rolled piece behind finishing tandem rolling unit tandem rolling, overheated or phase transformation can not appear in rolled piece.
The workpiece measurement in regulating according to the pass design of determining already (seeing Table 3.2) after each frame of tandem mill and the speed of drive motor.The mill speed scope of finishing mill is 2.0m/s-8.5m/s
The elongation pass of finishing mill is flat triangle pass schedule, and lengthening coefficient is 1.1-1.4; Last groove is flat triangle pass schedule and arc triangle-circular hole system, and lengthening coefficient is 1.02-1.1.
Detect the temperature of rolled piece by means of the infrared thermometry meter of the 18th frame back, in case of necessity, in the unlatching between milling train group and the mm finishing mill unit cooling device on the roller-way rolled piece is cooled off, perhaps reduce the mill speed of roughing mill the 1st frame simultaneously, guarantee that the finishing temperature of rolled piece is controlled at:
Pure titanium is 500-850 ℃;
700 ℃-1050 ℃ of titanium alloys.
Be determined at the rolled piece cross dimension after the frame No. 18 by No. 2 profilograph.
The excellent wire rod of Φ 14-8mm (14-8mm six sides, triangle) by roughing mill and middle mill milling.
Rolled piece after rolling, can take following two kinds of means of transportation:
4. be sent to cold bed and cutting machine part;
5. be sent to the rolling part;
The bar of Φ 14-8mm (14-8mm six sides, triangle)
In the finishing tandem rolling unit rolling after, be sent to before the cold bed, on No. 3 flying shear, the rolled piece of Φ 14-8mm is cut off.According to the size of rolling section bar blank and the relation of rolling task, determine the length of cutting off.
By means of No. 2 distributor and roller-way, the bar of shearing in advance is sent to cold bed No. 2, being cooled to temperature at air is 200-400 ℃.Chilled bar is sent to the discharge roller-way from cold bed, transports to finished product bar cut-off parts again.
At the abrasive cutting-off machine bar material cutting is become scale, here the length of Qie Duaning is according to the finished product charter, is determined by mobile stopper.According to the use rules of cutting machine, according to the sectional dimension of bar, to select the working system of cutting machine and cut off the quantity of bar simultaneously, the quality of shearing is dealt with the requirement of composite stocking.
For mechanical performance and the institutional framework that detects stocking, and the quality of control finished product stocking, should on stocking, take a sample.
Φ 16-8mm coiled material
By means of No. 2 dispenser device the rolled piece of Φ 14-8mm is sent to coiling machine No. 2, here rolled piece is wound up on the coil of wire of Φ 700mm.The finished product coil of wire is put on the platform conveyer, forwards on the baler again.When carrying the rolled piece of coiled coiled and carry out the air cooling, the cooled temperature of coiling is about 200 ℃-400 ℃.
On baler, take a sample, so that detect institutional framework and mechanical performance.
Table 3.3 pass designing unit: mm
Annotate: the A-plane triangle; B-arc triangular form; The C-hexagon; The D-circle.
The product size precision
The dimensional accuracy contrast of the excellent wire rod that the dimensional accuracy of the excellent wire rod that three-roller Y shaped tandem mill is rolling and two-roller mill are rolling sees Table 3.4.
The dimensional accuracy of table 3.4 rod wire rod
Claims (1)
1. the method for the rolling pure titanium or titanium alloy rod wire rod of a three-roller Y shaped tandem mill, it is characterized in that adopting three-roller Y shaped tandem rolling unit, by controlling the heating process in the three-roller Y shaped tandem rolling mill, slightly, in, the pass of finishing tandem rolling unit, speed, after the titanium or titanium alloy of diameter of phi 50 * 15000mm rod base once heated, rolling is the finished product circle of Φ 30-8mm, or 24-8mm six sides or triangle bar, or Φ 20-8mm/ substance is the rolling wire rod of 100kg, the roller of the three-roller Y shaped tandem mill of thick tandem rolling unit directly is 400-360mm, rolling pass 4-6, the elongation pass of roughing mill is flat triangle pass schedule, semi-finished product passage lengthening coefficient 1.2-1.5; Final pass lengthening coefficient 1.04-1.3, mill speed 0.1m/s-0.5m/s, the finishing temperature of pure titanium is controlled at 500 ℃-850 ℃, the finish to gauge of titanium alloy and rolls temperature and be controlled at 700 ℃-1050 ℃; The roller of the three-roller Y shaped tandem mill of middle tandem rolling unit directly is 340-320mm, rolling pass 2-6, semi-finished product passage lengthening coefficient 1.1-1.4, final pass lengthening coefficient 1.03-1.2, mill speed 0.4m/s-2.5m/s, the finishing temperature of pure titanium is controlled at 500 ℃-850 ℃, the finishing temperature of titanium alloy and is controlled at 700 ℃-1050 ℃;
The roller of the three-roller Y shaped tandem mill of finishing tandem rolling unit directly is 270-230mm, rolling pass 2-6, semi-finished product passage lengthening coefficient 1.1-1.3, final pass lengthening coefficient 1.02-1.1, mill speed 2.0m/s-8.5m/s, the finishing temperature of pure titanium is controlled at 500 ℃-850 ℃, the finishing temperature of titanium alloy and is controlled at 700 ℃-1050 ℃.
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